/**
 * @defgroup	libsd	MMC-/SD-Card
 * @ingroup		driver

\p	Library for accessing MMC and SD cards from the ScatterWeb sensor node.
Currently MSB430 and compatible nodes are supported.

\p This library has been optimized for to allow block independent
random read access. For any general read operation ::Sd_read should be the
best choice. For single bytes use ::Sd_read_byte and if you know exactly
what you are doing you can use ::Sd_read_block.
For best speed the blocklength should always be set to match the data to be read.

\p Note that while reading any number of bytes from any address is possible.
Writing to many (or all?) cards is only allowed in blocks of 512 bytes size.

\p For an example see the sd_sample demo application.

\p Since this library is beta and still in development you can contact
the author directly if you are quite sure that you found a bug. For
general questions please use the mailing list or consult the ScatterWeb
website:
http://scatterweb.mi.fu-berlin.de and the mailinglist
scatterweb@lists.spline.inf.fu-berlin.de (subscription via the Website).

*/